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Rails - Validate Presence Of Association?
...a model A that has a "has_many" association to another model B. I have a business requirement that an insert into A requires at least 1 associated record to B. Is there a method I can call to make sure this is true, or do I need to write a custom validation?
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iOS - How to set a UISwitch programmatically
I want to set my UISwitch to on or off programmatically. How would I do that? I am an iOS newbie.
5 Answers
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ASP MVC href to a controller/view
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There are a couple of ways that you can accomplish this. You can do the following:
<li>
@Html.ActionLink("Clients", "Index", "User", new { @class = "elements" }, null)
</li>
or this:
<li>
<a href="@Url.Ac...
Set background color of WPF Textbox in C# code
How can I change the background and foreground colors of a WPF Textbox programmatically in C#?
6 Answers
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Is generator.next() visible in Python 3?
...s is consistency: special methods like __init__() and __del__() all have double underscores (or "dunder" in the current vernacular), and .next() was one of the few exceptions to that rule. This was fixed in Python 3.0. [*]
But instead of calling g.__next__(), use next(g).
[*] There are other speci...
adb update a non-market apk?
Is there a way we can update (not reinstall) a non-market apk on an Android device?
I could only find an adb install (nothing like adb update)
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NUnit's Assert.Equals throws exception “Assert.Equals should not be used for assertions”
I recently attempted to use the method Assert.Equals() when writing a new NUnit test. Upon execution this method throws an AssertionException stating that
Assert.Equals should not be used for Assertions. This is a bit baffling at first glance. What's going on here?
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Python Write bytes to file
I have a function that returns a string. The string contains carriage returns and new line feeds (0x0D, 0x0A). However when I write to a file it contains only the new line feeds. Is there a way to get the output to include the carriage return and the new line feed.
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Bash Script: count unique lines in file
...ile (millions of lines) containing IP addresses and ports from a several hour network capture, one ip/port per line. Lines are of this format:
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SqlAlchemy - Filtering by Relationship Attribute
I don't have much experience with SQLAlchemy and I have a problem, which I can't solve. I tried searching and I tried a lot of code.
This is my Class (reduced to the most significant code):
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